Solving One-Step Equations ALGEBRA 1 LESSON 2-1 pages 77–80  Exercises 1. 8 2. –3 3. 13 4. 40 5. –1 6. 5 7. 1 8. 61.28 9. 17.12 10. –18 11. 4 12. –7 13. –57 14. 15. 3 16. 2 17. –1.5 18. 68.98 19. 38 + g = 41 ; 2 in. 20. 4.5 = t – 2.5; 7% 21. 500 22. 196 23. –18 24. –320 25. 196 26. –20 27. –245 28. 303 29. –9 30. –27 31. –10 32. 2 33. 16 34. –45 35. –72 5 11 1 3 2 3 3 4 1 2 3 4 1 3 2-1

Solving One-Step Equations ALGEBRA 1 LESSON 2-1 36. 6 37. 12 38. –4 39. 14 40. – 41. –15 42. –4 43. 8 44. –20 45. 2 46. –1 47. –13 3 5 48. 16 49. – 50. 51. –1 52. – 53. No; 96.26 is close to 100 and 62.74 is close to 60, so the difference is close to 40. 54. Answers may vary. Sample: CDs cost $15 each. How many CDs can you buy for $120? 55. 2.1 56. 18 57. – 58. –9 59. –60 60. 10.63 61. –11.4 62. –17.5 63. – 64. 243 65. –0.89 66. 13 4 5 4 7 1 4 9 11 3 8 1 3 2 7 1 2 5 9 5 18 2-1

Solving One-Step Equations ALGEBRA 1 LESSON 2-1 67. –3 68. –17.1 69. –1 70. 5.2p = 46; 8.8 in. 71. 189 = e – 1048; 1237 engineers 72. a. 106,000 + i = 4,930,000; 4,824,000 b. v = 1,928,000; 4,820,000 73. 17x = 106.25, $6.25 74. Answers may vary. Sample: A letter only needs to represent the same value in related equations. If equations are not related, the values of the variable may be different. 3 4 75. Subtr. Prop. of Eq. 76. a. The student forgot the neg. and used 112 instead of 11.2. b. The student could have estimated by finding the product of –6 and 11, which is –66. 77. 44 78. 14 79. 92 80. a. Let = cost of labor, (166.50) = ; = $55.50 b. $37.00/h 81. 71° 1 4 2 5 1 3 2-1